I grew up going to Sambo’s restaurants. As I was a kid, I can’t really compare it to Denny’s or IHOP or Coco’s or whatever; but I remember like it Sambo’s at the time. I always pictured Sambo as Indian, because of the pictures in the restaurants. On the other hand, I have an 8mm reel of Little Black Sambo put out by Castle Films that I think was originally filmed in the '20s or '30s. It does use the offensive ‘pickaninny’ images.
There was an episode of The Young Ones where a bobby lets fly a stream of epithets including ‘sambo-darkie’. In another episode (‘Bambi’) the posh Footlights College students mentioned a play they did called What-ho, Darki?. Obviously these were used to cast the police and upper-class as racist.
Dunno about ‘sambo’ but when I was growing up, many years ago, I used to visit my Grandmother. She had a collection of Blyton books that my mother had read as a kid. One of them was the adventures of three Gollywogs named Golly, Woggy and Nigger. I kid you not.
In the 1976 US TV series “The Jefferson’s”, there is an episode where George Jefferson (a black businessman) is having difficulty understanding the “British” English spoken by his UN translator neighbor Mr. Bentley.
Bentley: (trying to guess Jefferson’s weight) Let’s see Mr. Jefferson, you must be 10 stone.
Jefferson (to wife) : Did he say I was stoned?
…
later…
Bentley (exiting): Well Jambo!
Jefferson: Did you say “Sambo”?
Bentley (horrified): No, no, I said Jambo, it’s Swahili for “hello”, I can never remember what the word is for good-bye.
Jefferson’s reaction to the term sambo is one of outrage.